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Hydrothermal Synthesis and Photoluminescence of Hierarchical Lead Tungstate Superstructures: Effects of Reaction Temperature and Surfactants
Author(s) -
Guo Xiaohui,
Yang Jianping,
Deng Yonghui,
Wei Hao,
Zhao Dongyuan
Publication year - 2010
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.200901214
Subject(s) - photoluminescence , tungstate , chemistry , chemical engineering , hydrothermal circulation , ethylene oxide , nanomaterials , mesoporous material , bromide , oxide , luminescence , polymer , nanotechnology , materials science , copolymer , inorganic chemistry , organic chemistry , catalysis , optoelectronics , engineering
Lead tungstate (PbWO 4 ) crystals with unique hierarchical morphologies have been successfully synthesized in the presence of a triblock copolymer poly(ethylene oxide)‐poly(propylene oxide)‐poly(ethylene oxide) (EO 70 ‐PO 20 ‐EO 70 , P 123 ) under mild hydrothermal conditions. When reaction temperature is changed from 140 to 180 and 220 °C, the as‐obtained PbWO 4 samples can vary from flat tubular to rod‐shaped arrays and complex slabs with porous film texture on their surface. Meanwhile, by using polyvinylpyrolidone (PVP), cetyltrimethylammonium bromide (CTAB), andhydroxycellulose with distinct functional groups as structure‐directing agents, PbWO 4 samples such as polyhedrons and rods with porous groove texture, as well as tube‐shaped aggregate bundles, can be obtained. The optical properties of the as‐made PbWO 4 samples with various morphologies were examined by photoluminescence (PL) and Raman spectroscopy. Results show that PL of the rod‐like arrays and microtube structures is redshifted relative to that of the complex slab sample. In general, the present synthesis route may be extended to prepare other inorganic nanomaterials with special functions.